fix build

Author: inevity

connection.go

@@ -433,8 +433,12 @@ func (c *Connection) SetNotifyContext(op interface{}) (context.Context, error) {
 		return nil, err
 	}
 
-	var ctx context.Context
+//	var ctx context.Context
+	
+	ctx := context.Background()
 
+	// maybe no need this switch 
+	// why ctx is nil from beginOp?
 	switch op.(type) {
 	case *fuseops.NotifyInvalInodeOp:
 		ctx = c.beginOp(100+uint32(fusekernel.NotifyCodeInvalInode), 0)